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Operating expenses - Cost of VAS (Details) - ARS ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating expenses |  |  |
Cost of mobile value added services | $ (829) | $ (1,446) | $ (1,218)
Cost of fixed value added services | (45) | (53) | (38)
Total Cost of VAS | $ (874) | $ (1,499) | $ (1,256)

X
- Definition The amount of expense arising from value added services on fixed services. + References No definition available. + Details
Name: | teo_CostOfFixedValueAddedServices
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of expense arising from value added services on mobile services. + References No definition available. + Details
Name: | teo_CostOfMobileValueAddedServices
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of expense arising from value added services. + References No definition available. + Details
Name: | teo_CostOfValueAddedServices
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | teo_DisclosureOfOperatingExpensesAbstract
Namespace Prefix: | teo_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration